As I have stated before, I got another discus to replace the one who died. I have researched for days & have finally come up with what I hope will be a peaceful community tank. It certainly did not get off to a good start, but everything seems fine now. The minute I poured the neons into the tank, one of my discus killed one. I figure this was my fault. I shouldn't have opened the bag over the discus.Since then, things have been fine. ( no hostility )The discus swim towards the school & it parts to let them through. No chasing, etc. I also had a bad start with my 2 gourmais. One died when it was sucked up into the filter's intake tube. I followed the advice of my pet store owner. I took small sponges, cut an X in them & slipped over the intake tubes. It didn't work for that one gourmais. The gourmais, that survived, is staying pretty well on his own right now, but, when the discus approach it, there is no hostility. Hopefully I've reached a good combo !